Why are you so hung up on Polygamy? Aren't you happily married?
Purging paganism would get rid of a lot bad things.....don't you agree? Like Sun worship, statue veneration, prayers to dead folks that cannot hear you....cause they're dead, Sabbath ignoring, kneeling and repeatedly muttering meaningless [Matthew 6:7] babblings to a dead woman......while fingering little beads.
These are some things I would do away with. Many more can be mentioned....but you get the idea.